Imaging device including shake correction mechanism, and operation method and operation program thereof

ABSTRACT

A lens interchangeable digital camera includes an image sensor in which a subject image is formed on an imaging surface through an imaging optical system including a zoom lens and a sensor movement type shake correction mechanism that performs a sensor movement operation of moving the image sensor in a direction to cancel a shake. A zoom operation determination unit determines whether or not a zoom operation in which the zoom lens moves is being performed. In a case where the zoom operation determination unit determines that the zoom operation is being performed, an operation deciding unit prohibits a shift operation which is at least a part of a sensor movement operation which is allowed while the zoom operation is stopped.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Continuation of PCT International Application No.PCT/JP2018/035886 filed on 27 Sep. 2018, which claims priority under 35U.S.C § 119(a) to Japanese Patent Application No. 2017-187466 filed on28 Sep. 2017. The above application is hereby expressly incorporated byreference, in its entirety, into the present application.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention relates to an imaging device, and an operationmethod and an operation program thereof.

2. Description of the Related Art

A digital camera is widely used as an imaging device comprising an imagesensor that captures a subject. A subject image is formed on an imagingsurface of the image sensor through an imaging optical system. Theimaging optical system is housed in a lens barrel, and these arecollectively referred to as, for example, a lens portion. Some lensportions are provided in a camera body, and some lens portions areprovided separately from the camera body and are interchangeably mountedon a mount portion of the camera body (so-called lens unit).

There is a known lens portion having a zoom function for enlarging andreducing a subject image. An imaging optical system of the lens portionhaving the zoom function includes a zoom lens. The zoom lens moves alongan optical axis between a telephoto end and a wide (wide angle) end inresponse to a zoom instruction from a user. Hereinafter, the movement ofthe zoom lens in response to the zoom instruction is referred to as azoom operation.

The digital camera comprises a live view display function for displayinga captured image of a subject imaged by an image sensor on a displayunit such as a liquid crystal display in real time. The digital cameraalso comprises a shake correction mechanism that cancels the influenceof a shake occurring in a case where the user does not hold the camerain a stable and correct manner or in a case where the camera isinstalled on a vehicle such as a car or a ship.

JP2007-034141A describes a lens interchangeable digital camera equippedwith a lens unit having a zoom function and comprising a sensor movementtype shake correction mechanism. The sensor movement type shakecorrection mechanism performs a sensor movement operation of moving animage sensor in a direction to cancel a shake with respect to an imagingoptical system.

SUMMARY OF THE INVENTION

The sensor movement operation includes a rotation operation ofrotationally moving the image sensor in a state where a point throughwhich the optical axis of the imaging optical system passes (hereinafterreferred to as optical center) matches a center point of the imagingsurface (hereinafter referred to as image center), and a shift operationof moving the image sensor parallel to a plane perpendicular to theoptical axis of the imaging optical system. The optical center and theimage center do not shift in the rotation operation, but are shifted inthe shift operation.

Consider a case where the shift between the optical center and the imagecenter due to the shift operation occurs during the zoom operation. Inthe case, in the captured image of the live view display function, forexample, a zoom instruction is performed with intention of enlarging aface of a person appearing at the image center. However, the capturedimage may be enlarged based on the optical center since the opticalcenter is located at a position shifted from the face of the personappearing at the image center. As a result, the face of the personappearing at the image center before the enlargement may move to an edgeof the captured image without remaining at the image center after theenlargement. For this reason, in a case where the shift between theoptical center and the image center occurs during the zoom operation,imaging composition may be inconsistent with user intention.

An object of the present invention is to provide an imaging device, andan operation method and an operation program thereof capable of alwaysobtaining imaging composition consistent with the user intention in acase where a zoom operation is performed.

In order to solve the above problems, an imaging device according to theinvention includes an image sensor, a sensor movement type shakecorrection mechanism, a zoom operation determination unit, and anoperation deciding unit. In the image sensor, a subject image is formedon an imaging surface through an imaging optical system including a zoomlens. The sensor movement type shake correction mechanism performs asensor movement operation of moving the image sensor in a direction tocancel a shake. The zoom operation determination unit determines whetheror not a zoom operation in which the zoom lens moves is being performed.The operation deciding unit decides an operation of the shake correctionmechanism and restricts at least a part of the sensor movement operationwhich is allowed while the zoom operation is stopped in a case where thezoom operation determination unit determines that the zoom operation isbeing performed.

It is preferable that the sensor movement operation includes a pluralityof types of sensor movement operations having different movementdirections of the image sensor, and the operation deciding unitrestricts at least one of the plurality of types of sensor movementoperations.

It is preferable that the plurality of types of sensor movementoperations include a rotation operation of rotationally moving the imagesensor in a state where an optical center which is a point through whichan optical axis of the imaging optical system passes matches an imagecenter which is a center point of the imaging surface and a shiftoperation of moving the image sensor in parallel with a planeperpendicular to the optical axis, and the operation deciding unitrestricts at least the shift operation in a case where the zoomoperation determination unit determines that the zoom operation is beingperformed.

It is preferable that the operation deciding unit allows the rotationoperation regardless of whether the zoom operation is being performed orstopped.

It is preferable that the operation deciding unit changes a degree ofthe restriction according to a focal length that changes with the zoomoperation.

It is preferable that the restriction executed by the operation decidingunit while the zoom operation is performed includes an operationprohibition for prohibiting the sensor movement operation, and in thecase where the zoom operation determination unit determines that thezoom operation is being performed while the sensor movement type shakecorrection mechanism is operated, the operation deciding unit moves theimage sensor to an origin position and then executes the operationprohibition.

It is preferable that the operation deciding unit executes the operationprohibition in a case where the focal length is equal to or larger thana preset threshold value and does not execute the operation prohibitionin a case where the focal length is less than the threshold value.

It is preferable that the restriction executed by the operation decidingunit while the zoom operation is performed includes a range restrictionthat restricts a movable range of the image sensor compared with themovable range while the zoom operation is stopped.

It is preferable that the operation deciding unit restricts the movablerange in a case where the focal length is long compared with the movablerange in a case where the focal length is short.

It is preferable to provide a mount portion on which a plurality oftypes of lens units are interchangeably mounted.

It is preferable that in a case where the lens unit having a lensmovement type shake correction mechanism that performs a lens movementoperation of moving a correction lens which is a part of a plurality oflenses constituting the imaging optical system in a direction to cancelthe shake is mounted on the mount portion, the operation deciding unitcauses the lens movement type shake correction mechanism to perform thelens movement operation of canceling the sensor movement operation ofmoving the image sensor to the origin position.

It is preferable that in the case where the lens unit having a lensmovement type shake correction mechanism that performs a lens movementoperation of moving a correction lens which is a part of a plurality oflenses constituting the imaging optical system in a direction to cancelthe shake is mounted on the mount portion, the operation deciding unitreleases the restriction of the sensor movement operation in a casewhere the correction lens reaches an end of a movable range and thecancellation of the shake in the lens movement operation reaches a limitwhile the zoom operation is performed.

An operation method of an imaging device according to the inventionincludes a zoom operation determination step and an operation decidingstep. The imaging device includes an image sensor in which a subjectimage is formed on an imaging surface through an imaging optical systemincluding a zoom lens and a sensor movement type shake correctionmechanism that performs a sensor movement operation of moving the imagesensor in a direction to cancel a shake. The zoom operationdetermination step determines whether or not a zoom operation in whichthe zoom lens moves is being performed. The operation deciding stepdecides an operation of the shake correction mechanism and restricts atleast a part of the sensor movement operation which is allowed while thezoom operation is stopped in a case where determination is made in thezoom operation determination step that the zoom operation is beingperformed.

An operation program of an imaging device according to the inventioncauses a computer to execute a zoom operation determination function andan operation deciding function. The imaging device includes an imagesensor in which a subject image is formed on an imaging surface throughan imaging optical system including a zoom lens and a sensor movementtype shake correction mechanism that performs a sensor movementoperation of moving the image sensor in a direction to cancel a shake.The zoom operation determination function determines whether or not azoom operation in which the zoom lens moves is being performed. Theoperation deciding function decides an operation of the shake correctionmechanism and restricts at least a part of the sensor movement operationwhich is allowed while the zoom operation is stopped in a case wheredetermination is made by the zoom operation determination function thatthe zoom operation is being performed.

The present invention restricts at least a part of the sensor movementoperation of moving the image sensor in the direction to cancel theshake, which is allowed while the zoom operation is stopped. Therefore,it is possible to provide an imaging device, and an operation method andan operation program thereof capable of always obtaining imagingcomposition consistent with the user intention in the case where thezoom operation is performed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front external perspective view of a lens interchangeabledigital camera on which a lens unit is mounted.

FIG. 2 is a front external perspective view of the lens interchangeabledigital camera from which the lens unit is detached.

FIG. 3 is a rear external perspective view of the lens interchangeabledigital camera on which a lens unit is mounted.

FIG. 4 is a block diagram of the lens unit.

FIG. 5 is a block diagram of the lens interchangeable digital camera.

FIG. 6 is a diagram showing details of a shake correction mechanism anda sensor movement operation.

FIG. 7 is a block diagram of a CPU of the lens interchangeable digitalcamera.

FIG. 8 is a table showing operation deciding result information withrespect to determination result information.

FIG. 9 is a flowchart showing a processing procedure of the lensinterchangeable digital camera.

FIG. 10 is a table showing operation deciding result information forprohibiting also a rotation operation in a case where a zoom operationis being performed.

FIG. 11 is a table showing operation deciding result information forallowing only a roll operation in the case where the zoom operation isbeing performed.

FIG. 12 is a table showing operation deciding result information forrestricting a range of a shift operation in the case where the zoomoperation is being performed.

FIG. 13 is a diagram showing an example of prohibiting the shiftoperation according to a focal length.

FIG. 14 is a flowchart showing a processing procedure of the example ofprohibiting the shift operation according to the focal length.

FIG. 15 is a diagram showing an example of changing a degree of rangerestriction on the shift operation according to the focal length.

FIG. 16 is a flowchart showing a processing procedure of the example ofchanging the degree of range restriction on the shift operationaccording to the focal length.

FIG. 17 is a flowchart showing a processing procedure of the example ofchanging the degree of range restriction on the shift operationaccording to the focal length.

FIG. 18 is a diagram showing a case where the shift operation isperformed in wide angle imaging

FIG. 19 is a diagram showing a case where the shift operation isperformed in telephoto imaging.

FIG. 20 is a diagram showing an example of changing the degree of rangerestriction on the shift operation according to the focal length and ofprohibiting the shift operation.

FIG. 21 is a block diagram of a lens unit having a lens movement typeshake correction mechanism.

FIG. 22 is a diagram showing details of the lens movement type shakecorrection mechanism.

FIG. 23 is a diagram showing a flow of information from an operationdeciding unit to the lens movement type shake correction mechanism.

FIG. 24 is a diagram showing a state in which the sensor movementoperation of moving an image sensor to an origin position by a sensormovement type shake correction mechanism is canceled by the lensmovement type shake correction mechanism.

FIG. 25 is a flowchart showing a processing procedure of the lensinterchangeable digital camera according to a fourth embodiment.

FIG. 26 is a flowchart showing a processing procedure of the lensinterchangeable digital camera according to the fourth embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment

In FIGS. 1 to 3, a lens unit 11 is interchangeably mounted on a lensinterchangeable digital camera (hereinafter simply referred to as acamera) 10 as an imaging device. A mount portion 15 which is a circularopening is provided on a front surface of the camera 10. On the otherhand, an engaging portion 16 that engages with the mount portion 15 isprovided at a rear end of the lens unit 11. The engaging portion 16 isengaged with the mount portion 15 to mount the lens unit 11 to thecamera 10. FIGS. 1 and 3 show a state where the lens unit 11 is mountedon the camera 10, and FIG. 2 shows a state where the lens unit 11 isdetached from the camera 10.

A plurality of signal contacts 17 are disposed on the mount portion 15.Similarly, a plurality of signal contacts 18 are disposed on theengaging portion 16. In a case where the lens unit 11 is mounted on thecamera 10, the signal contacts 17 and the signal contacts 18 are incontact with each other and are electrically connected. Communicationbetween the camera 10 and the lens unit 11 becomes possible due to theconnection between the signal contacts 17 and 18.

An image sensor 19 is mounted on the camera 10. The image sensor 19 isdisposed on a deep side of the mount portion 15. The image sensor 19 is,for example, a charge coupled device (CCD) type or a complementary metaloxide semiconductor (CMOS) type, and has a rectangular imaging surface20. A plurality of pixels are arranged in a matrix on the imagingsurface 20. The pixel photoelectrically converts a subject image formedon the imaging surface 20 and outputs an imaging signal which is asource of image data of the subject.

A power lever 21, a release switch 22, an exposure correction dial 23, ashutter speed/International Organization for Standardization (ISO)sensitivity dial 24, a hot shoe 25, and the like are provided on anupper surface of the camera 10.

The power lever 21 is operated in a case where power of the camera 10 isturned on and off. The release switch 22 is operated in a case wherestatic image imaging is instructed or in a case where the start and theend of video imaging are instructed. The release switch 22 is atwo-stage press type. In a case where the release switch 22 is pressedto a first stage (half-pressed), a well-known imaging preparationprocessing such as automatic focus adjustment or automatic exposurecontrol is executed. In a case where the release switch 22 is pressed toa second stage (fully-pressed), the image sensor 19 is caused to executea main imaging operation (an operation of accumulating electric chargesin the pixels and outputting an imaging signal corresponding to theaccumulated electric charges). Accordingly, imaging processing forrecording image data output from the image sensor 19 as a captured imageis executed. Hereinafter, the full press of the release switch 22 isreferred to as a release operation.

The exposure correction dial 23 is operated in a case where an exposurevalue is corrected. The shutter speed/ISO sensitivity dial 24 isoperated in a case where the shutter speed and ISO sensitivity are set.An external flash device is attachably and detachably mounted on the hotshoe 25.

A display unit 27, an optical viewfinder 28, an operation key group 29,and the like are provided on a rear surface of the camera 10. Thedisplay unit 27 is composed of a liquid crystal display, for example.The display unit 27 performs so-called live view display in which thecaptured image of the subject represented by the image data from theimage sensor 19 is displayed in real time. This live view displayfunction is temporarily stopped during the imaging processingaccompanying the release operation and resumed after the imagingprocessing ends. In addition to the live view display, the display unit27 performs playback display of a recorded captured image or display ofvarious setting screens. The optical viewfinder 28 displays a subjectimage formed through the lens unit 11 and a pentaprism (not shown). Theoperation key group 29 is operated in a case where various settings areperformed on the various setting screens. A portion indicated by areference numeral 30 in FIGS. 1 to 3 is a cover that covers a memorycard slot on which a memory card 77 (refer to FIG. 5) is attachably anddetachably mounted.

An imaging optical system 35 is built in the lens unit 11. The imagingoptical system 35 forms a subject image on the imaging surface 20 of theimage sensor 19. Various operation rings such as a focus ring 36, a zoomring 37, and an iris ring 38 are mounted on the outer periphery of thelens unit 11. The above rings are rotatable along a circumferentialdirection. The focus ring 36 is operated during manual focus adjustment,the zoom ring 37 is operated during zooming, and the iris ring 38 isoperated in a case where an opening of an aperture stop formed by a stopmechanism 46 is set (refer to FIG. 4).

As shown in FIG. 4, the imaging optical system 35 comprises, forexample, a plurality of lenses 45A, 45B, 45C, and 45D and the stopmechanism 46. The lens 45A is a lens disposed at the forefront (subjectside) of the imaging optical system 35, and the lens 45D is a lensdisposed at the rearmost (image sensor 19 side) of the imaging opticalsystem 35. The focus lens 45B for the focus adjustment and the zoom lens45C for the zooming are disposed between the lenses 45A and 45D. As iswell known, the stop mechanism 46 has a plurality of stop leaf blades.The stop leaf blades form a substantially circular aperture stop andchange a size of the aperture stop to restrict an amount of incidenceray.

The focus lens 45B moves along an optical axis OA in response to anoperation of the focus ring 36. The zoom lens 45C moves along theoptical axis OA in response to an operation of the zoom ring 37.

An actuator 47 such as a motor and a position detection sensor 48 thatdetects a position on the optical axis OA are connected to the focuslens 45B. An optical system control unit 49 operates the actuator 47 tomove the focus lens 45B along the optical axis OA while checking theposition of the focus lens 45B on the optical axis OA based on adetection result of the position detection sensor 48 during theautomatic focus adjustment.

The stop mechanism 46 is also connected with an actuator 50 such as amotor for opening and closing the stop leaf blades and an openingdetection sensor 51 for detecting the opening of the aperture stop. Theoptical system control unit 49 operates the actuator 50 to open andclose the stop leaf blades while checking the opening of the aperturestop based on a detection result of the opening detection sensor 51. Theoptical system control unit 49 opens and closes the stop leaf bladessuch that an opening calculated on the camera 10 side is obtained duringthe automatic exposure control. Except during the automatic exposurecontrol, the stop leaf blades are opened and closed such that an openingset by the iris ring 38 is obtained.

The position detection sensor 52 for detecting the position on theoptical axis OA is connected to the zoom lens 45C, but an actuator suchas the motor is not connected thereto. That is, the zoom lens 45C movesalong the optical axis OA only in the case of the manual operation ofthe zoom ring 37. The actuator such as the motor may be connected to thezoom lens 45C such that the optical system control unit 49 can beelectrically controlled.

A communication control unit 53 controls communication with the camera10 through the signal contacts 18 of the engaging portion 16. Theoptical system control unit 49 is connected to the communication controlunit 53. The communication control unit 53 outputs various types ofinformation, such as the position of the focus lens 45B in the automaticfocus adjustment or the calculation result of the opening of theaperture stop in the automatic exposure control, to be transmitted fromthe camera 10 side to the optical system control unit 49. The opticalsystem control unit 49 operates the actuators 47 and 50 to adjust theposition of the focus lens 45B or the opening of the aperture stop basedon the various types of information from the communication control unit53.

Further, zoom operation information is input from the optical systemcontrol unit 49 to the communication control unit 53. The zoom operationinformation is output from the optical system control unit 49 to thecommunication control unit 53 in a case where the zoom ring 37 isoperated to move the zoom lens 45C along the optical axis OA, and theposition detection sensor 52 detects changing of a position of the zoomlens 45C on the optical axis OA, that is, in a case where the zoomoperation is being performed. The communication control unit 53transmits the zoom operation information from the optical system controlunit 49 to the camera 10.

In FIG. 5, the camera 10 comprises a shake correction mechanism 65, ananalog front end (AFE) 66, a digital signal processor (DSP) 67, a sensorcontrol unit 68, and a central processing unit (CPU) 69, a communicationcontrol unit 70, a frame memory 71, a display control unit 72, a cardcontrol unit 73, and a storage unit 74. These are connected to eachother through a data bus 75.

The shake correction mechanism 65 executes shake correction forcanceling the influence of a shake occurring in a case where the userdoes not hold the camera 10 in a stable and correct manner or in a casewhere the camera 10 is installed on a vehicle such as a car or a ship.The shake correction mechanism 65 is a sensor movement method thatperforms a sensor movement operation of moving the image sensor 19 in adirection to cancel the shake.

The AFE 66 performs correlative double sampling processing,amplification processing, or analog/digital conversion processing on theanalog imaging signal from the image sensor 19 to convert the signalinto image data having a gradation value corresponding to apredetermined number of bits and outputs the image data to the DSP 67.The DSP 67 performs known signal processing such as gamma-correctionprocessing, defective pixel correction processing, white balancecorrection processing, and demosaicing on the image data from the AFE66.

The sensor control unit 68 controls the operation of the image sensor19. Specifically, the sensor control unit 68 outputs a sensor controlsignal synchronized with a reference clock signal to be input from theCPU 69 to the image sensor 19 and causes the image sensor 19 to outputan imaging signal at a predetermined frame rate.

The CPU 69 integrally controls the operation of each unit of the camera10 based on an operation program 76 stored in the storage unit 74. Forexample, the CPU 69 executes the imaging preparation processing inresponse to the half press of the release switch 22 and executes theimaging processing in response to the release operation (full press ofthe release switch 22). Further, the CPU 69 executes processingaccording to various setting signals from the operation key group 29.FIG. 5 shows only the release switch 22 and the operation key group 29.However, the power lever 21, the exposure correction dial 23, theshutter speed/ISO sensitivity dial 24, and the like described above arealso connected to the data bus 75, and the CPU 69 executes processingcorresponding to these operation signals.

The communication control unit 70 controls communication with the lensunit 11 through the signal contacts 17 of the mount portion 15. Forexample, the communication control unit 70 receives the zoom operationinformation to be transmitted from the communication control unit 53.

The frame memory 71 stores one-frame image data subjected to varioustypes of signal processing by the DSP 67. The image data to be stored inthe frame memory 71 is updated at any time at a predetermined framerate.

The display control unit 72 converts the image data into a video signalsuch as a composite signal or a component signal and outputs the videosignal to the display unit 27 as the captured image. More specifically,the display control unit 72 reads out the image data to be updated atany time at a predetermined frame rate from the frame memory 71 andcauses the display unit 27 to perform the live view display based on theread image data. In addition, the display control unit 72 causes thedisplay unit 27 to play and display the captured image recorded in thememory card 77. In addition to the above, the display control unit 72causes the display unit 27 to display the various setting screens.

The card control unit 73 controls the recording of the captured image onthe memory card 77 and the reading out of the captured image from thememory card 77. In the imaging processing accompanying the releaseoperation, the card control unit 73 records the image data stored in theframe memory 71 at the time of the imaging processing in the memory card77 as the captured image.

In FIG. 6, the shake correction mechanism 65 is composed of a gyrosensor 85, a shake correction control unit 86, a position detectionsensor 87, and an actuator 88. The gyro sensor 85 detects a shake andoutputs the detection result to the shake correction control unit 86.The shake correction control unit 86 calculates a movement amount of theimage sensor 19 for canceling the shake detected by the gyro sensor 85.The shake correction control unit 86 finely adjusts the calculatedmovement amount based on a current position of the image sensor 19 fromthe position detection sensor 87 and outputs the result to the actuator88. The actuator 88 moves the image sensor 19 by the movement amountfrom the shake correction control unit 86.

The sensor movement operation includes a plurality of types of sensormovement operations in which movement directions of the image sensor 19are different. The plurality of types of sensor movement operationsinclude a rotation operation and a shift operation. The rotationoperation is to rotate and move the image sensor 19 in a state where anoptical center OC which is a point through which the optical axis OApasses and an image center IC which is the center point of the imagingsurface 20 are matched. For this reason, the optical center OC and theimage center IC do not shift in the rotation operation. On the contrary,the shift operation is to move the image sensor 19 in parallel with aplane perpendicular to the optical axis OA (XY plane). For this reason,the optical center OC and the image center IC are shifted in the shiftoperation.

The rotation operation includes a roll operation, a pitch operation, anda yaw operation. The roll operation is to rotate the image sensor 19around the optical axis OA as indicated by an arrow RO. The pitchoperation is to rotate the image sensor 19 around the X-axis along along side of the imaging surface 20 as indicated by an arrow PI. The yawoperation is to rotate the image sensor 19 around the Y-axis along ashort side of the imaging surface 20, perpendicular to the X-axis, asindicated by an arrow YA.

The shift operation includes a horizontal shift operation and a verticalshift operation. The horizontal shift operation is to move the imagesensor 19 along the X-axis. The vertical shift operation is to move theimage sensor 19 along the Y-axis. As described above, the shakecorrection mechanism 65 has a so-called five-axis shake correctionfunction for performing a total of five types of sensor movementoperations including the roll operation, the pitch operation, the yawoperation, a horizontal shift operation, and the vertical shiftoperation.

In FIG. 7, in a case where the operation program 76 is activated, theCPU 69 functions as a zoom operation determination unit 95 and anoperation deciding unit 96.

The zoom operation determination unit 95 has a zoom operationdetermination function for determining whether or not the zoom operationis being performed. More specifically, in a case where the zoomoperation information is input from the communication control unit 70,the zoom operation determination unit 95 determines that the zoomoperation is being performed. On the contrary, in a case where the zoomoperation information is not input from the communication control unit70, the zoom operation determination unit 95 determines that the zoomoperation is stopped. The zoom operation determination unit 95 outputsdetermination result information (refer to FIG. 8) indicating thedetermination result to the operation deciding unit 96.

The operation deciding unit 96 has an operation deciding function fordeciding the operation of the shake correction mechanism 65 according tothe determination result information from the zoom operationdetermination unit 95. In a case where the zoom operation determinationunit 95 determines that the zoom operation is being performed, theoperation deciding unit 96 restricts at least a part of the sensormovement operation that is allowed while the zoom operation is stopped.The operation deciding unit 96 outputs the operation deciding resultinformation indicating the decided operation to the shake correctionmechanism 65. The operation deciding result information is informationin which allowance or restriction on the operation is set for therotation operation and the shift operation, respectively (refer to FIG.8).

Although not shown, the CPU 69 is provided with an image correction unitthat corrects optical characteristics (edge part dimming, distortion,etc.) of the imaging optical system 35 of the lens unit 11 or imageprocessing unit that performs various types of image processing such ascolor enhancement processing or outline enhancement processing.

FIG. 8 shows a pattern of the operation deciding result information withrespect to the determination result information. First, in a case wherethe determination result information indicating that the zoom operationis stopped is output from the zoom operation determination unit 95, theoperation deciding unit 96 outputs operation deciding result informationA indicating that both the rotation operation and the shift operationare allowed. On the other hand, in a case where determination resultinformation indicating that the zoom operation is being performed isoutput from the zoom operation determination unit 95, the operationdeciding unit 96 outputs operation deciding result information Bindicating that the rotation operation is allowed but the shiftoperation is prohibited and restricted.

That is, the operation deciding unit 96 restricts at least the shiftoperation and allows the rotation operation regardless of whether thezoom operation is being performed or stopped. Further, the restrictionexecuted by the operation deciding unit 96 during the zoom operationincludes operation prohibition.

In a case where the zoom operation determination unit 95 determines thatthe zoom operation is being performed during the operation of the shakecorrection mechanism 65 and the optical center OC and the image centerIC are shifted due to the shift operation, the operation deciding unit96 moves the image sensor 19 to an origin position where the opticalcenter OC matches the image center IC and then executes the operationprohibition.

Actions of the above configuration will be described with reference to aflowchart in FIG. 9. First, the zoom operation determination unit 95determines whether or not the zoom operation is being performed (stepST100, zoom operation determination step).

In a case where determination is made that the zoom operation is stopped(NO in step ST110), the determination result information indicating thatthe zoom operation is stopped is output from the zoom operationdetermination unit 95 to the operation deciding unit 96 as shown in FIG.8. As indicated by the operation deciding result information A, theoperation deciding unit 96 decides that both the rotation operation andthe shift operation are allowed (step ST120, operation deciding step).In response to the deciding (operation deciding result information A),the rotation operation and the shift operation are allowed in the shakecorrection mechanism 65.

On the other hand, in a case where determination is made that the zoomoperation is being performed (YES in step ST110), the determinationresult information indicating that the zoom operation is being performedis output from the zoom operation determination unit 95 to the operationdeciding unit 96 as shown in FIG. 8. In the case, as indicated by theoperation deciding result information B, the operation deciding unit 96decides that the rotation operation is allowed but the shift operationis prohibited and restricted (step ST130, operation deciding step). Inresponse to the deciding (operation deciding result information B), therotation operation is allowed and the shift operation is prohibited inthe shake correction mechanism 65. In the case, the image sensor 19 ismoved to the origin position where the optical center OC matches theimage center IC and then the operation prohibition is executed, in acase where the optical center OC and the image center IC are shifted dueto the shift operation. These series of pieces of processing arecontinued until the power lever 21 is operated and the power of thecamera 10 is turned off (YES in step ST140).

At least a part of the sensor movement operation by the shake correctionmechanism 65 is restricted during the zoom operation. Therefore, it ispossible to prevent imaging composition from being inconsistent withuser intention such as the shift of a position of a main subject such asa face of a person before and after the zoom operation. Therefore, it ispossible to always obtain the imaging composition consistent with theuser intention in a case where the zoom operation is performed. Inparticular, since the shift operation in which the optical center OC andthe image center IC are shifted is prohibited, it is possible to surelyeliminate a possibility that the imaging composition may be inconsistentwith the user intention.

On the other hand, since the optical center OC and the image center ICare not shifted in the rotation operation, the rotation operation isallowed regardless of whether the zoom operation is being performed orstopped. Even in the case, there is no possibility that the imagingcomposition may be inconsistent with the user intention. In addition,since the shake correction by the rotation operation is alwaysperformed, it is possible to maintain image quality of the capturedimage at a certain level.

In a case where the optical center OC and the image center IC areshifted due to the shift operation, the image sensor 19 is moved to theorigin position where the optical center OC matches the image center ICand the operation prohibition is executed. Therefore, it is possible toperform the zoom operation in a state where the optical center OC surelymatches the image center IC.

In a case where the zoom operation is being performed, not only theshift operation but also the rotation operation may be prohibited andrestricted as in operation deciding result information C shown in FIG.10. In the case where the zoom operation is being performed, only theroll operation among the rotation operations may be allowed, and thepitch operation and the yaw operation may be prohibited and restrictedas in operation deciding result information D shown in FIG. 11. In otherwords, at least one of the plurality of types of sensor movementoperations may be restricted. The image sensor 19 is moved to the originposition of a rotation angle and the operation prohibition is executedalso for the rotation operation.

Further, a movable range of the shift operation in the case where thezoom operation is being performed may be restricted (range restriction)compared with a movable range while the zoom operation is stopped as inoperation deciding result information E shown in FIG. 12. For example, arange in which the shift between the optical center OC and the imagecenter IC is not so noticeable before and after the zoom operation isset as the movable range of the shift operation in the case where thezoom operation is being performed. For this reason, the movable range ofthe shift operation in the case where the zoom operation is beingperformed is a very narrow range compared with the movable range whilethe zoom operation is stopped.

In this manner, in a case where the shift operation is not completelyprohibited in the case where the zoom operation is being performed andthe shift operation is allowed even though the range is narrow, it ispossible to contribute to improving the image quality of the capturedimage.

More specifically, the shift operation of the shake correction mechanism65 is effective for, for example, the shake correction in an XYdirection that is likely to occur at the time of macro imaging. However,in a case where the shift operation of the shake correction mechanism 65is completely prohibited, the effective shake correction is notperformed. Therefore, the image quality of the captured image may besignificantly deteriorated. However, it is possible to eliminate such anadverse effect by allowing the shift operation as shown in FIG. 12.

Second Embodiment

In a second embodiment shown in FIGS. 13 to 20, a degree of restrictionon the sensor movement operation is changed according to a focal lengththat changes with the zoom operation. In the following, a description ofpoints that are common to the first embodiment will be omitted asappropriate, and differences from the first embodiment will be mainlydescribed. The same applies to the following embodiments.

FIGS. 13 and 14 are examples in a case where the shift operation isprohibited. In the case, the position of the zoom lens 45C on theoptical axis OA is included in the zoom operation information. The zoomoperation determination unit 95 calculates the focal length based on theposition of the zoom lens 45C on the optical axis OA. In addition todetermining whether or not the zoom operation is being performed,determination is made whether or not the focal length is equal to orlarger than a preset threshold value TH. The operation deciding unit 96executes the operation prohibition of the shift operation in a casewhere the focal length is equal to or larger than the threshold value THand allows the shift operation in a case where the focal length is lessthan the threshold value TH.

Here, the focal length is minimum at a wide (wide angle) end and maximumat a telephoto end. For this reason, the focal length equal to or largerthan the threshold value TH means that the focal length is the same asthe threshold value TH or closer to the telephoto end side than thethreshold value TH.

FIG. 14 is a flowchart showing a processing procedure of the camera 10in the case of FIG. 13. In the first embodiment, in the case where thezoom operation determination unit 95 determines that the zoom operationis being performed (YES in step ST110), the shift operation isprohibited unconditionally. On the contrary, in the second embodiment,in a case where the zoom operation determination unit 95 determines thatthe zoom operation is being performed and the focal length is determinedto be equal to or larger than the threshold value TH (YES in both stepsST110 and ST200), the operation deciding unit 96 prohibits the shiftoperation (step ST130, operation deciding step). On the contrary, in acase where the focal length is less than the threshold value TH (NO instep ST200), the operation deciding unit 96 allows the shift operation(step ST120, operation deciding step) as in the case where the zoomoperation is determined to be stopped (NO in step ST110).

FIGS. 15 to 17 are examples in the case of restricting the range of theshift operation. Also in the case, the zoom operation informationincludes the position of the zoom lens 45C on the optical axis OA, andthe zoom operation determination unit 95 calculates the focal lengthbased on the position of the zoom lens 45C on the optical axis OA as inthe cases of FIGS. 13 and 14. The zoom operation determination unit 95compares magnitude of the focal length with a first threshold value TH1and a second threshold value TH2 (TH1<TH2) in addition to determiningwhether or not the zoom operation is being performed. In a case wherethe zoom operation determination unit 95 determines that the focallength is equal to or larger than the wide end and equal to or less thanthe first threshold value TH1, the operation deciding unit 96 restrictsthe range of the shift operation to ½ of the movable range while thezoom operation is stopped. In a case where determination is made thatthe focal length is larger than the first threshold value TH1 and equalto or less than the second threshold value TH2, the range of the shiftoperation is restricted to ¼ of the movable range while the zoomoperation is stopped. In a case where determination is made that thefocal length is larger than the second threshold value TH2 and equal toor less than the telephoto end, the range of the shift operation isrestricted to ⅛ of the movable range while the zoom operation isstopped. That is, the movable range of the shift operation in the casewhere the focal length is long is restricted compared with the movablerange in the case where the focal length is short.

FIGS. 16 and 17 are flowcharts showing a processing procedure of thecamera 10 in the case of FIG. 15. That is, in a case where the zoomoperation determination unit 95 determines that the zoom operation isbeing performed and the focal length is determined to be equal to orlarger than the wide end and equal to or less than the first thresholdvalue TH1 (YES in both steps ST110 and ST250), the operation decidingunit 96 restricts the range of the shift operation to ½ of the movablerange while the zoom operation is stopped (step ST260, operationdeciding step). On the contrary, in a case where the focal length isequal to or larger than the wide end and not equal to or less than thefirst threshold value TH1 (NO in step ST250), the processing proceeds tostep ST270 in FIG. 17.

In FIG. 17, in a case where the zoom operation determination unit 95determines that the focal length is larger than the first thresholdvalue TH1 and equal to or less than the second threshold value TH2 (YESin step ST270), the operation deciding unit 96 restricts the range ofthe shift operation to ¼ of the movable range while the zoom operationis stopped (step ST280, operation deciding step). Further, in a casewhere the zoom operation determination unit 95 determines that the focallength is larger than the second threshold value TH2 and equal to orless than the telephoto end (NO in step ST270), the operation decidingunit 96 restricts the range of the shift operation to ⅛ of the movablerange while the zoom operation is stopped (step ST290, operationdeciding step).

As described above, the operation prohibition of the sensor movementoperation (shift operation) is executed in a case where the focal lengthis equal to or larger than the threshold value TH, and the operationprohibition thereof is not executed in a case where the focal length isless than the threshold value TH. Alternatively, the movable range ofthe sensor movement operation (shift operation) in a case where thefocal length is long is restricted compared with the movable range in acase where the focal length is short. Therefore, it is possible toenhance a probability that a main subject, which is a subject desired tobe imaged mainly by the user, fits within the imaging composition.

More specifically, in a case of wide angle imaging with a relativelyshort focal length, a face MS of the person who is the main subjectappears relatively small as shown in FIG. 18. For this reason, even in acase where the optical center OC and the image center IC are shifted bythe shift operation, the face MS is within the imaging composition asshown below an arrow.

On the contrary, in a case of telephoto imaging with a relatively longfocal length, the face MS thereof appears relatively large as shown inFIG. 19. For this reason, in the case where the optical center OC andthe image center IC are shifted by the shift operation, the face MSthereof is out of the imaging composition as shown below an arrow. Thatis, the telephoto imaging in FIG. 19 has a higher probability that themain subject is out of the imaging composition due to the shiftoperation than the wide angle imaging in FIG. 18.

In the second embodiment, the operation prohibition of the sensormovement operation (shift operation) is executed or the movable range ofthe sensor movement operation (shift operation) is restricted, in thecase of telephoto imaging having the high probability that the mainsubject is out of the imaging composition due to the shift operation.With this, the probability that the main subject fits within the imagingcomposition increases, and thus it is possible to obtain the imagingcomposition consistent with the user intention more surely.

The range restriction stage is not restricted to the above three stages.Three or more threshold values may be set to restrict the range to fouror more stages. Further, a degree of the range restriction is notrestricted to the above-mentioned ½, ¼, and ⅛, and the setting can bechanged as appropriate.

The example of the case where the shift operation is prohibited as shownin FIGS. 13 and 14 may be performed by being combined with the exampleof the case where the range of the shift operation is restricted asshown in FIGS. 15 to 17. Specifically, in a case where the zoomoperation determination unit 95 determines that the focal length isequal to or larger than the wide end and equal to or less than the firstthreshold value TH1, the operation deciding unit 96 restricts the rangeof the shift operation to ½ of the movable range while the zoomoperation is stopped as shown in FIG. 20. In a case where determinationis made that the focal length is larger than the first threshold valueTH1 and equal to or less than the second threshold value TH2, the rangeof the shift operation is restricted to ¼ of the movable range while thezoom operation is stopped. In a case where determination is made thatthe focal length is larger than the second threshold value TH2 and equalto or less than the telephoto end, the operation prohibition of theshift operation is executed. The same effect as described above can alsobe obtained by the example of FIG. 20.

Third Embodiment

In a third embodiment shown in FIGS. 21 to 24, in a case where a lensunit having a lens movement type shake correction mechanism is mountedon the mount portion, the sensor movement operation in which a sensormovement type shake correction mechanism 65 moves the image sensor 19 tothe origin position is canceled by a lens movement type shake correctionmechanism.

A lens unit 100 shown in FIG. 21 has an imaging optical system 102including a correction lens 101 in addition to the lenses 45A to 45D andthe stop mechanism 46 according to the first embodiment. The lens unit100 has a lens movement type shake correction mechanism 103 thatperforms a lens movement operation of moving the correction lens 101 ina direction to cancel out the shake. The communication control unit 53is connected to the shake correction mechanism 103. The shake correctionmechanism 103 exchanges various types of information with the camera 10through the communication control unit 53.

As shown in FIG. 22, the lens movement type shake correction mechanism103 basically comprises the same configuration as the sensor movementtype shake correction mechanism 65 shown in FIG. 6 and includes a gyrosensor 110, a shake correction control unit 111, a position detectionsensor 112, and an actuator 113. The shake correction mechanism 103operates independently of the shake correction mechanism 65.

The shake correction mechanism 103 performs only a shift operation ofmoving the correction lens 101 parallel to the XY plane perpendicular tothe optical axis OA as the lens movement operation and does not performthe rotation operation. Further, the shake correction mechanism 103aligns the optical center OC with the image center IC by the lensmovement operation. For this reason, the optical center OC alwaysmatches the image center IC in the lens movement operation. Therefore,the shake correction mechanism 103 always performs the lens movementoperation regardless of whether the zoom operation is being performed orstopped.

As shown in FIG. 23, in a case where the lens unit 100 is mounted on themount portion 15, the operation deciding unit 96 outputs sensor movementamount information and a synchronization signal in a case where thesensor movement type shake correction mechanism 65 moves the imagesensor 19 to the origin position by the sensor movement operation. Thesensor movement amount information is information indicating themovement amount of the image sensor 19 to the origin position by thesensor movement operation. The synchronization signal is a signal forsynchronizing the sensor movement operation of moving the image sensor19 to the origin position and the lens movement operation of cancelingthe sensor movement operation. The synchronization signal is, forexample, a timepoint when the sensor movement operation of moving theimage sensor 19 to the origin position is scheduled.

The operation deciding unit 96 outputs the sensor movement amountinformation and the synchronization signal to the communication controlunit 70 of the camera 10. The communication control unit 70 transmitsthe sensor movement amount information and the synchronization signal tothe communication control unit 53 of the lens unit 100. Thecommunication control unit 53 outputs the sensor movement amountinformation and the synchronization signal to the lens movement typeshake correction mechanism 103.

As shown in FIG. 24, the shake correction mechanism 103 of the lens unit100 performs the lens movement operation of canceling the sensormovement operation in synchronization with the sensor movement operationof the sensor movement type shake correction mechanism 65 that moves theimage sensor 19 to the origin position based on the sensor movementamount information and the synchronization signal.

In this manner, the lens movement type shake correction mechanism 103performs the lens movement operation of canceling the sensor movementoperation of the sensor movement type shake correction mechanism 65 thatmoves the image sensor 19 to the origin position. Therefore, it ispossible to eliminate the shake of the captured image due to the sensormovement operation of moving the image sensor 19 to the origin position.Therefore, there is no possibility that the user feels uncomfortable ina case where the captured image is viewed in live view display.

Fourth Embodiment

In a fourth embodiment shown in FIGS. 25 and 26, in the case where thelens unit 100 is mounted on the mount portion 15, in a case where thecorrection lens 101 reaches an end of the movable range while the zoomoperation is performed and the cancellation of shake in the lensmovement operation reaches a limit, the restriction on the sensormovement operation is released.

In the fourth embodiment, the lens movement type shake correctionmechanism 103 outputs a position detection result of the correction lens101 by the position detection sensor 112 to the communication controlunit 53. The position detection result of the correction lens 101 istransmitted from the communication control unit 53 to the communicationcontrol unit 70 of the camera 10 and is further output from thecommunication control unit 70 to the zoom operation determination unit95.

The zoom operation determination unit 95 determines whether or not thecorrection lens 101 reaches the end of the movable range and thecancellation of shake in the lens movement operation reaches the limitbased on the position detection result of the correction lens 101. Themovable range of the correction lens 101 is, for example, transmittedfrom the lens unit 100 in a case where the lens unit 100 is mounted andstored in the storage unit 74.

In a case where the zoom operation determination unit 95 determines thatthe cancellation of the shake in the lens movement operation reaches thelimit, the operation deciding unit 96 releases the restriction on thesensor movement operation of the sensor movement type shake correctionmechanism 65.

FIGS. 25 and 26 are flowcharts showing a processing procedure of thecamera 10 according to the fourth embodiment. In a case where the zoomoperation determination unit 95 determines that the zoom operation isbeing performed and the cancellation of the shake in the lens movementoperation does not reach the limit (YES in step ST110 and NO in stepST400), the operation deciding unit 96 prohibits the shift operation ofthe sensor movement type shake correction mechanism 65 (step ST130,operation deciding step) as in the case where determination is made thatthe zoom operation is being performed in the first embodiment.

On the other hand, in a case where determination is made that thecancellation of the shake in the lens movement operation reaches thelimit (YES in step ST400), the operation deciding unit 96 releases theprohibition of the shift operation of the sensor movement type shakecorrection mechanism 65 as shown in FIG. 26 (step ST410, operationdeciding step). In the case, in a case where the optical center OC andthe image center IC are shifted due to the shift operation, the imagesensor 19 is moved to the origin position where the optical center OCmatches the image center IC.

The case where the correction lens 101 reaches the end of the movablerange and the cancellation of shake in the lens movement operationreaches the limit is a state where a considerable amount of shakeoccurs. In the state, suppression of the deterioration in the imagequality of the captured image due to the shake is first decided ratherthan the shift of the imaging composition while the zoom operation isperformed caused by the shift between the optical center OC and theimage center IC. In the fourth embodiment, in the case where thecancellation of the shake in the lens movement operation reaches thelimit, the restriction on the sensor movement operation is released evenwhile the zoom operation is performed. With this, it is possible tosuppress the deterioration in the image quality of the captured imagedue to the shake. Since the image sensor 19 always moves from the originposition, it is possible to minimize the shift between the opticalcenter OC and the image center IC.

In each of the embodiments described above, for example, hardwarestructures of the processing units, such as the zoom operationdetermination unit 95 and the operation deciding unit 96, that executevarious pieces of processing are various processors as shown below.

The various processors include a CPU, a programmable logic device (PLD),a dedicated circuitry, and the like. The CPU is a general-purposeprocessor that executes software (program) to function as variousprocessing units as well known. The PLD is a processor whose circuitconfiguration can be changed after manufacturing, such as a fieldprogrammable gate array (FPGA). The dedicated circuitry is a processorhaving a circuit configuration designed specially for executing specificprocessing, such as an application specific integrated circuit (ASIC).

One processing unit may be composed of one of these various processorsor a combination of two or more processors having the same type ordifferent types (for example, combination of a plurality of FPGAs, or aCPU and an FPGA). A plurality of processing units may be composed of oneprocessor. As an example of composing the plurality of processing unitswith one processor, first, there is a form in which one processor iscomposed of a combination of one or more CPUs and software and theprocessor functions as the plurality of processing units. Second, thereis a form of using a processor realizing the functions of the entiresystem including the plurality of processing units with one IC chip, asrepresented by a system on chip (SoC) or the like. As described above,the various processing units are composed of one or more of the variousprocessors described above as the hardware structure.

Further, the hardware structure of these various processors is, morespecifically, a circuitry combining circuit elements such as asemiconductor element.

From the above description, it is possible to grasp the imaging devicedescribed in the following additional item 1.

[Additional Item 1]

In an imaging device including an image sensor in which a subject imageis formed on an imaging surface through an imaging optical systemincluding a zoom lens and a sensor movement type shake correctionmechanism that performs a sensor movement operation of moving the imagesensor in a direction to cancel a shake, the imaging device comprises azoom operation determination processor that determines whether or not azoom operation in which the zoom lens moves is being performed, and anoperation deciding processor that decides an operation of the shakecorrection mechanism according to a determination result of the zoomoperation determination processor, in which the operation decidingprocessor restricts at least a part of the sensor movement operationwhich is allowed while the zoom operation is stopped in a case wheredetermination is made by the zoom operation determination processor thatthe zoom operation is being performed.

In each of the embodiments described above, the lens interchangeabledigital camera 10 is exemplified as the imaging device, but the presentinvention is not limited thereto. The present invention is alsoadaptable to a digital camera in which a lens portion is providedintegrally with a camera body. The invention is also adaptable to avideo camera, a mobile phone with a camera, or the like.

Needless to say, the present invention is not limited to each embodimentdescribed above, and various configurations may be employed withoutdeparting from the gist of the invention.

EXPLANATION OF REFERENCES

10: lens interchangeable digital camera (camera)

11, 100: lens unit

15: mount portion

16: engaging portion

17, 18: signal contact

19: image sensor

20: imaging surface

21: power lever

22: release switch

23: exposure correction dial

24: shutter speed/ISO sensitivity dial

25: hot shoe

27: display unit

28: optical viewfinder

29: operation key group

30: lid

35, 102: imaging optical system

36: focus ring

37: zoom ring

38: iris ring

45A, 45D: lens

45B: focus lens

45C: zoom lens

46: stop mechanism

47, 50: actuator

48, 52: position detection sensor

49: optical system control unit

51: opening detection sensor

53: communication control unit

65: shake correction mechanism (sensor movement type shake correctionmechanism)

66: analog front end (AFE)

67: digital signal processor (DSP)

68: sensor control unit

69: central processing unit (CPU)

70: communication control unit

71: frame memory

72: display control unit

73: card control unit

74: storage unit

75: data bus

76: operation program

77: memory card

85, 110: gyro sensor

86, 111: shake correction control unit

87, 112: position detection sensor

88, 113: actuator

95: zoom operation determination unit

96: operation deciding unit

101: correction lens

103: shake correction mechanism (lens movement type shake correctionmechanism)

OA: optical axis

OC: optical center

IC: image center

X: axis along long side of imaging surface

Y: axis along short side of imaging surface

RO: arrow indicating roll operation

PI: arrow indicating pitch operation

YA: arrow indicating yaw operation

ST100 to ST140, ST200, ST250 to ST290, ST400, ST410: step

MS: face of person (main subject)

What is claimed is:
 1. An imaging device comprising: an image sensor inwhich a subject image is formed on an imaging surface through an imagingoptical system including a zoom lens; a sensor movement type shakecorrection mechanism that performs a sensor movement operation of movingthe image sensor in a direction to cancel a shake; and a processorconfigured to: determine whether or not a zoom operation in which thezoom lens moves is being performed; and decide an operation of the shakecorrection mechanism and restricts, when the shake correction mechanismis active, at least a part of the sensor movement operation which isallowed while the zoom operation is stopped in a case where it isdetermined that the zoom operation is being performed, wherein thesensor movement operation includes a plurality of types of sensormovement operations having different movement directions of the imagesensor, and the processor restricts at least one of the plurality oftypes of sensor movement operations, the plurality of types of sensormovement operations include a rotation operation of rotationally movingthe image sensor in a state where an optical center which is a pointthrough which an optical axis of the imaging optical system passesmatches an image center which is a center point of the imaging surfaceand a shift operation of moving the image sensor in parallel with aplane perpendicular to the optical axis, and the processor restricts atleast the shift operation in a case where it is determined that the zoomoperation is being performed, and the processor allows the rotationoperation regardless of whether the zoom operation is being performed orstopped.
 2. The imaging device according to claim 1, wherein theprocessor changes a degree of the restriction according to a focallength that changes with the zoom operation.
 3. The imaging deviceaccording to claim 1, wherein the restriction executed by the processorwhile the zoom operation is performed includes an operation prohibitionfor prohibiting the sensor movement operation, and in the case where itis determined that the zoom operation is being performed while thesensor movement type shake correction mechanism is operated, theprocessor moves the image sensor to an origin position and then executesthe operation prohibition.
 4. The imaging device according to claim 3,wherein the processor changes a degree of the restriction according to afocal length that changes with the zoom operation, and the processorexecutes the operation prohibition in a case where the focal length isequal to or larger than a preset threshold value and does not executethe operation prohibition in a case where the focal length is less thanthe threshold value.
 5. The imaging device according to claim 1, whereinthe restriction executed by the processor while the zoom operation isperformed includes a range restriction that restricts a movable range ofthe image sensor compared with the movable range while the zoomoperation is stopped.
 6. The imaging device according to claim 5,wherein the processor changes a degree of the restriction according to afocal length that changes with the zoom operation, and the processorrestricts the movable range in a case where the focal length is longcompared with the movable range in a case where the focal length isshort.
 7. The imaging device according to claim 1, further comprising: amount portion on which a plurality of types of lens units areinterchangeably mounted.
 8. The imaging device according to claim 7,wherein the restriction executed by the processor while the zoomoperation is performed includes an operation prohibition for prohibitingthe sensor movement operation, in the case where it is determined thatthe zoom operation is being performed while the sensor movement typeshake correction mechanism is operated, the processor moves the imagesensor to an origin position and then executes the operationprohibition, and in a case where the lens unit having a lens movementtype shake correction mechanism that performs a lens movement operationof moving a correction lens which is a part of a plurality of lensesconstituting the imaging optical system in a direction to cancel theshake is mounted on the mount portion, the processor causes the lensmovement type shake correction mechanism to perform the lens movementoperation of canceling the sensor movement operation of moving the imagesensor to the origin position.
 9. The imaging device according to claim7, wherein in the case where the lens unit having a lens movement typeshake correction mechanism that performs a lens movement operation ofmoving a correction lens which is a part of a plurality of lensesconstituting the imaging optical system in a direction to cancel theshake is mounted on the mount portion, the processor releases therestriction of the sensor movement operation in a case where thecorrection lens reaches an end of a movable range and the cancellationof the shake in the lens movement operation reaches a limit while thezoom operation is performed.
 10. An operation method of an imagingdevice including an image sensor in which a subject image is formed onan imaging surface through an imaging optical system including a zoomlens and a sensor movement type shake correction mechanism that performsa sensor movement operation of moving the image sensor in a direction tocancel a shake, the method comprising: a zoom operation determinationstep of determining whether or not a zoom operation in which the zoomlens moves is being performed; and an operation deciding step ofdeciding an operation of the shake correction mechanism and restricting,when the shake correction mechanism is active, at least a part of thesensor movement operation which is allowed while the zoom operation isstopped in a case where determination is made in the zoom operationdetermination step that the zoom operation is being performed, whereinthe sensor movement operation includes a plurality of types of sensormovement operations having different movement directions of the imagesensor, and at least one of the plurality of types of sensor movementoperations is restricted, the plurality of types of sensor movementoperations include a rotation operation of rotationally moving the imagesensor in a state where an optical center which is a point through whichan optical axis of the imaging optical system passes matches an imagecenter which is a center point of the imaging surface and a shiftoperation of moving the image sensor in parallel with a planeperpendicular to the optical axis, and, in a case where it is determinedthat the zoom operation is being performed, at least the shift operationis restricted, and the rotation operation is allowed regardless ofwhether the zoom operation is being performed or stopped.
 11. Anon-transitory computer readable medium for storing acomputer-executable program for an imaging device including an imagesensor in which a subject image is formed on an imaging surface throughan imaging optical system including a zoom lens and a sensor movementtype shake correction mechanism that performs a sensor movementoperation of moving the image sensor in a direction to cancel a shake,the computer-executable program causing a computer to execute: a zoomoperation determination function of determining whether or not a zoomoperation in which the zoom lens moves is being performed; and anoperation deciding function of deciding an operation of the shakecorrection mechanism and restricting, when the shake correctionmechanism is active, at least a part of the sensor movement operationwhich is allowed while the zoom operation is stopped in a case wheredetermination is made by the zoom operation determination function thatthe zoom operation is being performed, wherein the sensor movementoperation includes a plurality of types of sensor movement operationshaving different movement directions of the image sensor, and at leastone of the plurality of types of sensor movement operations isrestricted, the plurality of types of sensor movement operations includea rotation operation of rotationally moving the image sensor in a statewhere an optical center which is a point through which an optical axisof the imaging optical system passes matches an image center which is acenter point of the imaging surface and a shift operation of moving theimage sensor in parallel with a plane perpendicular to the optical axis,and, in a case where it is determined that the zoom operation is beingperformed, at least the shift operation is restricted, and the rotationoperation is allowed regardless of whether the zoom operation is beingperformed or stopped.